Aerial photo taken on July 19, 2020 shows water gushing out from sluiceways of the Xiaolangdi Reservoir on the Yellow River in central China's Henan Province. The Xiaolangdi Reservoir has continued to release floodwater since July 1, preparing for the critical period of flood control of the Yellow River. (Photo by Jia Fangwen/Xinhua)

Photo taken on July 19, 2020 shows water gushing out from sluiceways of the Xiaolangdi Reservoir on the Yellow River in central China's Henan Province. The Xiaolangdi Reservoir has continued to release floodwater since July 1, preparing for the critical period of flood control of the Yellow River. (Photo by Miao Qiunao/Xinhua)

Aerial photo taken on July 19, 2020 shows water gushing out from sluiceways of the Xiaolangdi Reservoir on the Yellow River in central China's Henan Province. The Xiaolangdi Reservoir has continued to release floodwater since July 1, preparing for the critical period of flood control of the Yellow River. (Photo by Jia Fangwen/Xinhua)

Aerial photo taken on July 19, 2020 shows water gushing out from sluiceways of the Xiaolangdi Reservoir on the Yellow River in central China's Henan Province. The Xiaolangdi Reservoir has continued to release floodwater since July 1, preparing for the critical period of flood control of the Yellow River. (Photo by Jia Fangwen/Xinhua)